JPS5799373A - Continuous drying and baking method - Google Patents

Abstract

PURPOSE: To enable simultaneously drying and backing paints on the two surfaces of a metal strip, when different paints are applied to the two surfaces of the metal strip at once, by changing the injection speed, injection rate, temperature or the like of hot air to be sprayed in the paint-drying and baking step.

CONSTITUTION: The two surfaces of a steel strip 1 are undercoated with the same paint by the surface coater 12a and the back-side coater 12b of a coater roll mechanism 12, and the undercoat paint is dried and baked in the drying zone 10a and the baking zone 10b of the first oven 10. The strip 1 is then carried through a forcibly cooling chamber 15, a water cooling chamber 16 and a hot air drying chamber 17, to remove water adherent to the surface of the strip 1. Thereafter, different paints are applied to the strip 1 by the surface coater 22a and the back-side coater 22b of the second coater roll mechanism 22. Hot gases suitable for drying and baking the paints on the upper and lower surfaces are injected from upper and lower injection nozzles 23a, 23b and 24b in the drying zone 20a and the baking zone 20b of the second oven 20, respectively, while changing their injection speeds, injection rates and temperatures. As a result, the paint films on the upper and lower surfaces are dried and baked at the same time.

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